<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app"></div>
    <!-- 加载 React。-->
    <!-- 注意: 部署时，将 "development.js" 替换为 "production.min.js"。-->
    <script src="https://unpkg.com/react@16/umd/react.development.js" crossorigin></script>
    <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js" crossorigin></script>
    <!-- 加载babel -->
    <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
    <script type="text/babel">
        // 渲染组件
        class App extends React.Component {
            constructor(){
                super();
                this.state = {
                    message: "hello world"
                }
            };
            render(){
                return (
                    <div>
                        <h2>{this.state.message}</h2>
                        <button onClick={this.textChange}>更换文字</button>
                    </div>
                )
            };
            textChange(){
                console.log(this)
                this.setState({
                    
                })
            };
        }
        // 展示组件
        ReactDOM.render(<App/>, document.getElementById("app"));
    </script>
</body>
</html>